NUDIBRANCHIATE GASTEROPODA. 39 



cuticula, that was dark-coloured towards its inner edge. The tongue was short and powerful, only 

 2-25 mm long, and of almost the same height and breadth, with an almost colourless radula. In this 

 latter were counted 13 series of tooth-plates; farther back, in the short (2 ram long) whitish radula sheath 

 that was directed backward, 12 series were found, two of which were not yet quite developed; thus 

 the total number of series was 25; but on the lower edge of the tongue marks were visible of 8 series 

 that had fallen off. The tooth-plates were almost colourless (very pale yellowish), highly fragile, and 

 all the plates on the tongue were worn or otherwise injured (fig. 14). The breadth between the legs 

 of the foremost tooth-plates was o-20 mm , but it rose to o-35 mm . The median tooth-plates (fig. 12) were 

 of a shape somewhat different from that in the two other species; they were broader and their hook 

 shorter. The lateral plates were likewise of a somewhat different shape (figs. 13 — 15), and the denticu- 

 lation of the edge of the hook was far slighter than in the typical species. 



The whitish salivary glands were lengthened and stretched to the lower side of the sto- 

 mach; their excretory duct was rather long. 



The oesophagus short (4 mm longl. The form of the stomach was oval, it had a length of 13™™ 

 by a diameter of up to j mm , and on the inside were strong longitudinal folds; it receives on either 

 side a biliary duct, and from the hindmost part of its right side it sends forth the intestine, inside of 

 which it, as it were, continues in the chief biliary duct (the blind bag of the stomach). The in- 

 testine runs along the upper edge of the anterior genital mass, forms a curve downward, and rises 

 to the anal papilla; its whole length was i8 mm by diameter of 2-5 — 2 mm ; its inside showed numerous 

 longitudinal folds. — The abundant white contents of the alimentary canal were an indeterminable 

 animal mass, in which were to be seen remains of Copepoda, bristles of Annelids, and a large quantity 

 of cnidce. 



The chief biliary duct runs somewhat curved in a deep furrow on the lower side of the 

 hermaphrodite gland, receives from either side several rather short, ramifying biliary ducts, and con- 

 tinues a little way behind the hermaphrodite gland. The branches of this duct, as well as of the 

 other two biliary ducts are covered with liver-cells, and form thus the thick, and, as it were, some- 

 what spongy layer of slightly yellowish liver mass covering the sides of the body above and the 

 lateral parts of the back, and shining through on the outside (fig. 7); from this layer the liver lobes 

 of the dorsal papillae rise, almost filling out their cavity; they are almost cylindrical, only little rugged. 

 At the points of the papillae the lengthened cnidocyst is seen, filled with mostly rounded cnidse. 



The ventricle of the heart had a length of 4 - 5 mm . The renal layer and the pericardio-renal 

 organ as before described. 



The hermaphrodite gland was powerful, yellowish, its whole length was 22 mm by a breadth 

 in front of o, mm ; in front it projects with a somewhat flattened lobe under the rectum and the stomach; 

 it consists of a number of large lobes, made up of smaller ones; its end-lobes contained large oogene 

 cells and developed zoosperms. — The anterior genital mass was large, lengthened, compressed, 

 running along, and attached to, the right side of the stomach; it had a length of 14™™ by a height 

 of 9'5 mm , and a thickness of 5 mm ; the light yellowish gray ampulla of the duct of the hermaphrodite 

 gland (fig. 1 b) ran for the greater part of its length along its inside; at its fore end the windings of 



